I find

  [op,:l]:= flattenOps x
  --needed since "op" is string in some spad code
  if STRINGP op then (op := INTERN op; x:= [op,:l])

and a bit later

  op is ["$elt",targ,fun] or not $InteractiveMode and op is
["elt",targ,fun] =>

and

  x is ["-",a,b] =>

How can the last expression ever become true if op has been intern'ed?

Ralf

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